Noun
a Japanese supervisor
Source: WordNetHowever, each kobun, in turn, can offer sakazuki as oyabun to his underling to form an affiliated organisation, which might in turn form lower ranked organizations. Source: Internet
Sometimes an underboss may do this in penance to the oyabun if he wants to spare a member of his own gang from further retaliation. Source: Internet
Those who have received sake from oyabun are part of the immediate family and ranked in terms of elder or younger brothers. Source: Internet